Automatic control method of butadiene polymerization

Abstract

The invention relates to an automatic control method of butadiene polymerization, which comprises the steps that: the reaction temperature is divided into six stages, when the temperature in a reactor changes, the actual value of the temperature and the set valve of the temperature have difference, and the output valve of a PID regulation action temperature regulator is taken as the set valve of a liquid ammonia regulator; the temperature of the reactor is controlled within the normal range; when the pressure exceeds the high limit valve, the set valve of the temperature regulator at this moment is stored into a register, and the set valve of the temperature regulator is endowed with lower valve again; the pressure in the reactor is reduced; when the liquid level of ammonia reaches to the high limit valve, the output valve of the ammonia regulator is manually set into a full-closed state until the liquid level of ammonia is lower than low limit valve, and temperature-liquid level cascade stage adjustment is changed back; and the data stored into the register is taken as the set valve of the temperature regulator again for automatic control. The automatic control method improves the quality of butadiene, leads the conversion rate to reach 91-92%, avoids the phenomena of implosion and surfusion, reduces the energy consumption and material consumption, and ensures a device to have stable operation.

Description

Technical field: [0001] The invention relates to an automatic control method for butadiene polymerization reaction in the production process of ABS. Background technique: [0002] In the ABS production process, the butadiene polymerization process is a key step in the ABS production process. In the process of butadiene polymerization, the heat of reaction must be taken away by the cooling medium. According to the different reaction conditions, there are two control methods: cooling with water and cooling with liquid nitrogen. This technology is based on liquid ammonia cooling control method. [0003] In the liquid ammonia cooling control method, a large amount of polymerization heat is removed through the evaporation of liquid ammonia in the jacket of the reactor, and the change of the ammonia liquid level changes the speed of ammonia evaporation, so as to realize the control of the temperature and pressure in the reactor, so as to ensure that the reaction is carried out ac...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a liquid ammonia cooling control butadiene reaction system mainly based on temperature-liquid level cascade adjustment and monitoring pressure at the same time, so as to realize automatic control of butadiene polymerization, solve quality and safety problems, improve Productivity

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